Improvement in heating-furncaes



H. HOLG'OMB. Heating Furnace.

N0. %O2,43 Pa-tented April 6,1878. I l

ATTORNEYS.

UNITED STATES PATENT OFFICE.

HENRY HOLGOMB, OF PAINESVILLE, OHIO.

IMPROVEMENT IN HEATlNG-FURNCAES.

Specification forming part of Letters Patent No. 202,439, dated April16, 1878; application filed January 11, [878.

To all whom it may concern:

Be it known that I, HENRY HOLCOMB, of Painesville, county of Lake, andState of Ohio, haw e invented a new and lmp roved Heating- Furnace, ofwhich the following is a specification: W V

Figure l is a vertical section taken on line m 00 in Fig. 2. Fig. 2 is ahorizontal section taken on line 3 y in Fig. 1. Fig. 3 is a horizontalsection taken on line 2 z in Fig. 1. Fig. 4 is an inverted plan view ofthe annular gasburner.

Similar letters of reference indicate corresponding parts.

The present invention relates to that class of hot-air furnaces whichare provided with automatic means for regulating the admission of coldair into the fire-chamber.

The invention consists in the construction and combination of parts,which will be hereinafter more fully described, and then specific:

ally set forth in the claims.

Referring to the drawing, A is the casing of the furnace, which in thepresent case is cylindrical in form. It is provided with the cap B, tothe under surface of which the conical lining G is attached, inclosingthe air-space a.

In the lower portion of the casing A there is a combustion-chamber, D,which is elliptical in plan and has vertical sides. In the top of thischamber there is a short circular flue, E, which communicates with thedrum F, which it also supports. In the flue E there is a hollow ring, G,whose aperture is conical, being largest at the top. This ring issupported centrally in the flue E, leaving around it the space I), andit is provided with the air-supply pipe 0, which extends outward throughthe casin g A, and is connected with the valve-casing d. The ring G isperforated in its under side, and above it in the flue E a cone, 0, isplaced, which concentrates the flame, and thoroughly mixes the airentering through the perforations of the ring with the gas evolved fromthe burning fuel.

The flues in the drum F are arranged in two series one series, H,composed of fines f, surrounding the fiue E, and connected together bythe webs g. A space, h, is left in the series H for the escape of theproducts of combustion to the space between the series H and incoal-furnaces will enter the chamber underneath the grate. The upper andlower heads I Z of the casing L are apertured, and upon the uppersurface of each head a valve, m, is placed. These valves are connectedtogether by a rod, '12, which passes through a guide-bar, 0, in thecasing L. The heads of the valvecasing d are also apertured, theaperturesbe- 'ing covered by valves 19, which are connected by the rodg, which passes through a guide bar, 4", in the casing (I. These rods aq are connected together by a stirrup, s, which is movable, withincertain limits, upon the lower rod a, to admit of moving the valves 19 asmall distance, while the valves m remain unmoved.

Above the drum F there are two forked lever-supports, t a, which aresecured to opposite sides of the casing A. In the support it threelevers, a b c, are fulcrumed on the pivot d, and in the support a twolevers, c f, are fulcrumed on the pivot g. A strip, h, of brass or otherexpansible metal is apertured to receive the pivot g in the support a,and is pivoted to one end of the lever a. To the opposite end of thelever to an expansion-strip, h, is pivoted, which is also pivoted to oneend of the lever e To the opposite end of the lever e anexpansion-strip, k is pivoted, which is also pivoted to the lever 12. Inlike manner the opposite end of the lever b is connected, by theexpansion-strip M, with the lever f, which lever is connected with thelever c by the expansion-strip h. The end of the lever 0 cpposite'thatto which the strip h is attached is connected, by the expansionstrip 7L5and chain 1', with a sector-lever, j, which is pivoted in a support, is,projecting from the casing A. The

chain i is wound partly around the bars of the sector-leverj, so thatwhen the expansion strips which connect the several levers, as al-'ready described, expand or contract, the sec tor-lever will be moved.

A perforated strip, l", is attached to the rod g by means of a stirrup,m, and. a chain, n, which is attached to the upper end of the curvedsurface of the sector-lever, hooks into one or the other of theapertures in the strip Z, so that the adjustment of the valves may bealtered to suit the temperature to be maintained.

It will be observed that the movement of the chain is equal to the totalof the motion of all of the expansion-strips, so that the sector-leveris moved by a slight variation of the tem perature in the casing A.

The contraction of the strips raises the sector-lever, and open-s firstthe valves 1), so as to admit air to the flue E, and thus insure theperfect combustion of the gas evolved from the burning fuel.

Should the temperature in the casing A continue to fall, the contractionof the brass strips raises the valves m and admits air to thecombustion-chamber through the tube K. An increase in temperatureexpands the brass strips, and permits the valves to drop to their seatsand exclude air from the furnace.

The combustion'chamber D is provided with a double door, M, whichinclos'es an air-space, q, that prevents the radiation of heat throughthe door. Both walls of the door are apertured and provided with a micacovering, which admits of looking into the fire without opening thedoor.

In one side of the casing A there is a door, N, in which is placed avessel, 0, for containing water to render the air heated by the furnacehumid.

I am aware that a hollow air-distributin g ring has been located in thecombustion-chamber of a furnace above the level of the fuel-bed for thepurpose of supplying the necessary air for the combustion of gases.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent 1. In a hot-air furnace, the double walled orjacketed air-distributin g ring Gr, having a central opening for thepassage of the gases of combustion, bottom air-discharge openings, and asurrounding space, in communication with the combustion and airheatingchambers, the flue E, surrounding the air-distributer, and thesuperposed ring a, in combination with the combustion-chamber D,heating-drum F, and air-inlet pipe, as and for the purpose set forth.

2. The air-inlet casing L, having apertured end heads I l, valves m, andvalve-rod n, and the upper air-inlet casing 01, having apertured ends,valves 19, valve-rod q, and swivel or slide connection 8 with the lowervalve-rod, in combination with the combustion-chamber D andair-supplying pipes K c, as and for the purpose set forth.

3. The combination of the levers a b c e f and the expansion-strips h h.h k k with the brackets or supports t a, the casin g A, the chain 2',and a valve mechanism for supplying air to the furnace, as and for thepurpose set forth.

HENRY HOLOOMB.

Witnesses:

L. STERLING, L. E. TUTTLE.

